MC250.8 - Alto Professional
Contents
1. eee MODE SWITCHES e MODE SWITCHES MODE SWITCHES BRIDGE MONO PP RP 2 0 29 er Fais Channel2 STEREO MODE 1234 59606 7 8 910 Channel1 5 2 Operate MC250 8 Power Amplifier In Parallel Mode In this mode the channel 1 input signal will be output from the output connectors of both channel 1 and channel 2 he channel 2 input jack is not used The channel 1 and channel 2 volumes can be adjusted independently Furthermore channel1 can only be parallelled with channel2 channel 3 only with channel 4 channel 5 only with channel 6 and channel 7 only with channel 8 L Apparaten skall anslutas m 5 till jordat uttag den gt ON oe ee DI mm 1 ansluts till ett natverk ENT 10 4d P1 BREAKER ID OLIT Dpoo odqoooo Coo E ES E ES E Ee 02 2 mE 02 X cu Lio d POE Pd I DELETE ELE NT cus A K 12345678910 BM 123456789 10 BM 12345678910 12345678910 MODE SWITCHES MODE SWITCHES Sm i Ces e exea pDopopoooo d CH7 CH8 il ieee 2 J a c x e Sos m ae E 2 D T PARALLEL MODE ag 1 2 3 4 5 6 7 8 910 Channel1 J 4 K 5 3 Operate MC250 8 In Bridge Mode In this m2. Kingdom and Taiwan The core of our digital audio products is a sophisticated Software Team for many years Following this idea we create our products and we will create the new ones From our side we guarantee you and we will guarantee you also in future the best quality the best fruits of our continuous researches and the best prices Nothing else to add but that we would like to thank all the people that made the MC250 8 eight channels Power Amplifier and thank our designers and all the ALTO staff people who make possible the realization of products containing our idea of music and sound and are ready to support you our customers in the best way conscious that you are our best richness TABLE OF CONTENTS 1 INTRODUC eM S B n 4 2 FEATURES ehe aiiud E UE MR EE 4 3 CONIROL ELEMENT S c 5 INSTACLA TION E 7 SEI S Remo Mamm 8 6 CAUTION FOR APPLICATION caca eux Feb mee 10 6 TECHNICAL SPECIFIGATIONS 12 9 WARRANTY 13 1 INTRODUCTION The MC250 8 eight Channels Power Amplifier is designed for professional use and provides unparal
3. MC250 8 to mains via the supplied power cord Fans on rear panel The unit is equipped with two fans in the back which can accelerate the flow of air to lower the temperature inside unit The inside temperature determines the fan speed which controls the inside air flowing speed 4 Installation 4 1 Mains connection Do not insert the power cord into this unit until voltage has been correctly set Please confirm if the power cord is connected correctly Please ensure that the MC250 8 professional power amplifier is supplied with the correct voltage before turning on this unit If you can t power up this unit while turning on the mains switch 1 check the Breaker 14 on the rear panel first and check if it is in the release state Otherwise contact the technician or qualified personnel for checking if the unit power is 3000W or for any other service Caution To reduce the risk of electric shock do not perform any servicing other than contained in this manual unless you are qualified to do so Please turn off this unit before any installation and connection esp when you connect your unit into the sound system This is important to prevent damage to the unit itself as well as other consequent speaker system This is important to prevent damage to the unit itself as well as other consequent speaker system The mains connection of the MC 250 8 professional power amplifier is made by using the enclosed power cord and a standard IEC receptacle a
4. rights reserved to ALTO All features and content might be changed without prior notice Any photocopy translation or reproduction of part of this manual without written permission is forbidden Copyright 2006 SEIKAKU GROUP NF02620 1 1
5. the level that is predetermined by the threshold setting selected it may result in the undesirable distortion in order to avoid the distortion the clip begins if the dip switch are set at OFF the clip limit doesn t work CLIP LIMIT ON2 3 4 5 6 7 8 9ON OFF OFF Filter this unit are equipped with two low cut filter eliminating unwanted low frequency signals like rumble noise 75Hz and 35Hz When 2 amp 9 are set to the top position set 3 amp 8 to the top position 35Hz low cut filter is activated Set 3 amp 8 to the bottom position 75Hz low cut filter is activated FILTER ON I O N C UN 75Hz FILTER B 35Hz FILTER 75HzFILTER 35 2 FILTER EN B FILTER ON FILTER OFF FILTER OFF 12 Output Terminal You can output the powered signal by the specific output connectors according to the actual application circumstance When the output terminal is connected with speaker you can complete the connection as the way we signed in this manual Caution turn off the unit before connecting the output connectors so as to avoid any electric shock 13 This switch works as fuse for protecting unit from damage When unit is overloaded or the temperature inside the unit is too high this push button will spring up and break the power supply The power supply will be restored with pushing this switch again AC Inlet This standard IEC receptacle is supplied to allow to connect your
6. 17 7 44 95 cm D 3 5 8 9 cm H 19 02 48 3 cm L 9 WARRANTY 1 WARRANTY REGISTRATION CARD To obtain Warranty Service the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date All the information presented in this Warranty Registration Card gives the manufacturer a better understanding of the sales status so as to purport a more effective and efficient after sales warranty service Please fill out all the information carefully and genuinely miswriting or absence of this card will void your warranty service RETURN NOTICE 2 1 In case of return for any warranty service please make sure that the product is well packed in its original shipping carton and it can protect your unit from any other extra damage 2 2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine and give detail information about your return address and contact telephone number 2 3 A brief description of the defect will be appreciated 2 4 Please prepay all the costs involved in the return shipping handling and insurance TERMS AND CONDITIONS 3 1 ALTO warrants that this product will be free from any defects in materials and or workmanship for a period of 1 year from the purchase date if you have completed the Warranty Registration Card in time 3 2 The warranty service is only available to the original consumer who purchased this product
7. User s Manual MC250 8 EIGHT CHANNELS POWER AMPLIFIER MAC ESOT omn rentia mere a LTO www altoproaudio com Version 1 1 Nov 2006 English SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol wherever used alerts you to the pre sence of un insulated and dangerous voltages with in the product enclosure These are voltages that may be sufficient to constitute the risk of electric shock or death This symbol wherever used alerts you to impo rtant operating and maintenance instructions Please read Q Protective Ground Terminal mains Alternating Current 1 Hazardous Live Terminal ON Denotes the product is turned on OFF Denotes the product is turned off WARNING Describes precautions that should be observed to prevent the possibility of death or injury to the user CAUTION Describes precautions that should be observed to prevent damage to the product Disposing of this product should not be placed in municipal waste and should be mmm collection WARNING Power Supply Ensure that the mains source voltage AC outlet matches the voltage rating of the product Failure to do so could result in damage to the product and possibly the user Unplug the product before electrical storms occur and when unused for long periods of time to reduce the risk of electric shock or fire External Connection Always use proper ready ma
8. de Selector You can choose the right function and output you need via the mode selector switch In order to make you acquire these settings now let me introduce the dip switch 3456 7 8 910 This switch is made up of 10 small dip switches these small dip switches from1 to 5 control one channel these rest ones 6 10 control the other channel ok you can choose the right mode setting you need via these small dip switches Take the dip switch of channel 1 and channel 2 for example Channel 3 and channel 4 are the same as channel 1 and channel 2 Output Mode Selector This unit provides three output modes stereo bridge and parallel Here are some details Stereo mode set the small dip switches 4 5 6 7 down to the bottom then channel 1 and channel 2 are in stereo mode STEREO MODE 12345678910 Parallel mode set the small switchesf 4 5 6 to top and small switch 7 down then channel 1 and channel 2 are in parallel mode PARALLEL MODE 12345678 910 Bridge mode set the small dip switch 7 up to the top and the dip switches 4 5 6 to the bottom then channel 1 and channel 2 are in bridge mode BRIDGE MODE 12345678 910 Please refer to chapter 5 for the connection of loads in detail 6 function selector Clip limit set these small dip switches of 1 ON and 10 ON at ON position then the clip limit of channel 1 and channel 2 has been working once the output level is reach or exceed
9. de insulated mains cabling power cord Failure to do so could result in shock death or fire If in doubt seek advice from a registered electrician Do Not Remove Any Covers Within the product are areas where high voltages may present To reduce the risk of electric shock do not remove any covers unless the AC mains power cord is removed Covers should be removed by qualified service personnel only No user serviceable parts inside e Fuse To prevent fire and damage to the product use only the recommended fuse type as indicated in this manual Do not short circuit the fuse holder Before replacing the fuse make sure that the product is OFF and disconnected from the AC outlet Protective Ground Before turning the product ON make sure that it is connected to Ground This is to prevent the risk of electric shock Never cut internal or external Ground wires Likewise never remove Ground wiring from the Protective Ground Terminal Operating Conditions Always install in accordance with the manufacturer s instructions To avoid the risk of electric shock and damage do not subject this product to any liquid rain or moisture Do not use this product when in close proximity to water Do not install this product near any direct heat source Do not block areas of ventilation Failure to do so could result in fire Keep product away from naked flames IMPORTANT SAFETY INSTRUCTIONS Read these instructions Follow all
10. directly from the retail dealer and it can not be transferred 3 3 During the warranty service ALTO may repair or replace this product at its own option at no charge to you for parts or for labor in accordance with the right side of this limited warranty 3 4 This warranty does not apply to the damages to this product that occurred as the following conditions Instead of operating in accordance with the user s manual thoroughly any abuse or misuse of this product Normal tear and wear e The product has been altered or modified in any way e Damage which may have been caused either directly or indirectly by another product force etc Abnormal service or repairing by anyone other than the qualified personnel or technician And in such cases all the expenses will be charged to the buyer 3 5 In no event shall ALTO be liable for any incidental or consequential damages Some states do not allow the exclu sion or limitation of incidental or consequential damages so the above exclusion or limitation may not apply to you 3 6 This warranty gives you the specific rights and these rights are compatible with the state laws you may also have other statutory rights that may vary from state to state SEIKAKU TECHNICAL GROUP LIMITED SEKAKU ELECTRON INDUSTRY CO LTD No 1 Lane 17 Sec 2 Han Shi West Road Taichung 40151 Taiwan http www altoproaudio com Tel 886 4 22313737 email alto altoproaudio com Fax 886 4 22346757 All
11. ed with the amplifier outputs when this indicator flashes when over heat protection or DC protection is activated At this time protection LED lights up and audio output is shut down automatically and no sound is outputted When the amplifier have no malfunction all the protection systems deactivate and protection LED lights off 5 Signal LED After signal is inputted LED becomes brighter while the signal level increases 6 Level Control This pot is used to adjust output level 7 Fan The unit is equipped with two fans in the front which can accelerate the flow of air to lower the temperature inside unit The inside temperature determines the fan speed which controls the inside air flowing speed Bridge Mode LED Indicator When you operate the unit in bridge mode the LED indicator lights up As for the bridge mode refer to 3 2 rear panel a 9 Parallel Mode LED Indicator When you operate the unit power amplifier in parallel mode the LED indicator lights up As for the parallel mode refer to 3 2 rear panel a 3 2 The Rear Panel m mS m com 20 Pa E ue 0000o DIN AEREI 3E SS SUE NV e mim EXISTE 9 dT 15 cH5 E Em E Ex 2 cui E E Ld ZIN 7 7 Girt 19 INPUT Terminal This unit is provided with balanced terminals which are used to connect the input signal Channel 1 and channel 2 are used in bridge and parallel mode a Mo
12. instructions Keep these instructions Do not discard Heed all warnings Only use attachments accessories specified by the manufacturer Power Cord and Plug Do not tamper with the power cord or plug These are designed for your safety Do not remove Ground connections If the plug does not fit your AC outlet seek advice from a qualified electrician Protect the power cord and plug from any physical stress to avoid risk of electric shock Do not place heavy objects on the power cord This could cause electric shock or fire Cleaning When required either blow off dust from the product or use a dry cloth Do not use any solvents such as Benzol or Alcohol For safety keep product clean and free from dust Servicing Refer all servicing to qualified service personnel only Do not perform any servicing other than those instruc tions contained within the User s Manual PREFACE Thank you for choosing MC250 8 eight channel Power Amplifier and thanks for choosing one of the results of ALTO AUDIO TEAM job and research For our ALTO AUDIO TEAM music and sound are more than a job is first of all passion and let us say our obsession We have been designing professional audio products for a long time in cooperation with some of the major brands in the world in the audio field The ALTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R amp D centers in Italy Netherlands United
13. leled quality Includes soft start signal limit four variable speed low noise fans and includes eight independent channels with separate power supply Each channel is equipped with independent protective circuitry against open circuit short circuit mismatched loads and overheat Furthermore every channel has also a protection LED that lights up before the amplifier is in normal operation and flashes when the amplifier is in over load protection or short circuit protection and lights up when over heat protection or DC protection occurs CLIP LED that shows true amplifier clipping The high qualitycomponents and the carefully designed circuits ensure excellent audio performance and an extremely linear frequency response giving crystal clear sound in the high range and an up front full bodied bottom end This amplifier guarantees total reliability and a trouble free use even in the most demanding conditions We believe the MC250 8 not only look great but provide a perfect performance what you get is unprecedented performance at an incredibly attractive price 2 FEATURE e Innovative design and high stability power amplifier e Fan cooled AB class high power amplifier in 19 2U size e 8 independent channels with separate protection system e DC infrasonic overheat amp short circuit protection e Smart designed protection system for auto re operation after fault e Parallel input channel 1 to channel 2 channel to channel 4 channel 5 t
14. nd it meets all of the international safety certification requirement 7 4 2 Rack Mounting the most secure mounting is on a universal rack shelf available from various rack manufactures or your music dealer The MC250 8 professional power amplifier fits into one standard 19 rack unit of space Be sure that there is enough air space around the unit for sufficient ventilation If heat release is inadequate this unit will retain heat inside which may cause the protection or even a fire 5 Application The MC250 8 provides three operating modes with each unit stereo mode parallel mode and bridged mode you can decide each specific operating mode according to your actual application circumstance Following examples will show you the typical connections you can refer to install your MC250 8 into a sound system 5 1 Operate MC250 8 Power Amplifier In Stereo Mode In this mode each channel works independently The signal inputted from one channel will be outputted from the corresponding channel den ansluts till ett n tverk 1m 0 04 11 BREAKER 0000000 O 04 104 0d DX X XT h H2 E cHe mE mmm mE 2 E E C 7 1 Apparaten skall anslutas amp m CH5 mM cH M 8 till jordat uttag CX CH3 CH4 do PE od og RAREZA ca 1234567 12 123
15. o channel 6 channel 7 to channel 8 e Allowing selection of Stereo Bridge or parallel operation e Ultra low noise and hum e High pass filter allow selection of flat 35 Hz or 75Hz protect speakers and prevent speaker transformer saturation with minimal effect on program material e DIP switch control for clip limit high pass filter bridge mono stereo selections e AUTO variable speed low noise fans ensure high reliability even under demanding conditions e Detachable Euroblock Barrier strip input connectors e Rugged amplifier in a strong compact chassis 3 CONTROL ELEMENTS 3 1 The Front Panel lifier amp 7 n 24 1 16 128 2 26 SIG 28 30 BRDG CH4 1 Power Switch It switches on off MC250 8 main power 2 Power LED This LED lights up when the amplifier is powered on 3 Clip LED When the respective channel s output signal distortion exceeds 0 596 the red LED clip indicator lights up it will warn you that the level of the input signal is too high and may cause distortion please attenuate the level of the input signal 4 Protection LED This red LED indicator lights up when the amplifier is powered ON and the soft start protection system is working No sound is outputted during soft start protection If short circuit protection or over load protection is activated this indicator flashes and no sound is outputted The speakers system is actually disconnect
16. ode signal inputted from channel1can be output from the bridge output connectors In this case use the channel 1 volume control to adjust the volume Turn the volume control of channel2 counterclockwise completely Then you can control the volume of the whole system by adjusting the channel 1 volume control Furthermore channel1 can be bridged with channel2 only channel3 with channel4 only channel5 with channel 6 only and channel 7 with channel 8 only CIE Apparaten skall anslutas E CHS mM CH3 E m till jordat uttag nar den ansluts till ett n tverk S 11 a e e 9 oppoooooQ 2 mU CH Ir CH3 CH4 H4 rh mmm ES mu oppooocoo CH CH6 CH7 CH8 EO le s P 12 3 4 5 6 7 8 9 10 123456478910 12345678910 E 12345678910 DEN EN TN MODE SWITCHES OUTPUTS AC INPUT BRIDGE MODE 123456798910 6 CAUTION FOR APPLICATION 6 1 General Application instruction the following instructions describe the common ways to install your MC250 8 power amplifier into a sound application system First turn off power switch before connection Refer to chapter 5 for speaker connection MC250 8 power amplifier may be operated in one of the three modes please slide the mode selector for the Specific operating mode 6 2 caution for speak connection The output capacity of MC 250 8
17. power amplifier is very high be sure to use a speaker system that has sufficient input capacity If the input capacity of your speaker system is lower than the rated output of the MC250 8 power amplifier you can protect your speakers by connecting a fuse serially between the speaker and the amplifier as shown below Output e o BEM s EEM ommum Ex Vaii Him os ve ax cus m mi m fem NV CAS Use the following formula to determine fuse capacity according to the speaker s input capacity Pozl R Iz Po R Po W Speaker s continuous input capacity noise or RMS R O Speakers nominal impedance Required fuse capacity 15273405 607 819 10 As to the speaker cable if you use a long one use as thick a cable as possible to prevent deterioration of the damping factor or power loss inside the cable 7 BLOCK DIAGRAM a PR 8 TECHNICAL SPECIFICATION Model MC250 8 20Hz 20kHz 90 196 THD stereo Mode 8 ohms per channel EIAJ 4 ohms per channel Distortion SMPTE IM Damping Factor 1kHz 0 196THD EIAJ Signal to Noise 20Hz 20kHz Controls Front AC Switch Ch1 Ch8 Gain Knobs Rear MODE SWITCHES Indicators Power On Blue LED Protection Red LED Signal Green LED Clip Red LED Parallel input Yellow LED Bridge Yellow LED Output Screw terminal Barrier Block 220 240 110 120 Vac 50 60 Hz
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